• Title/Summary/Keyword: Plastic Optic lens

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Retardation Analysis of Plastic Optic Lens according to Injection Speed Variation (사출속도 변화에 따른 플라스틱 광학렌즈의 위상차 해석)

  • Park, Soo-Hyun;Kim, Tae-Kyu;Kwak, Tae-Soo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.2
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    • pp.93-98
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    • 2015
  • This study focuses on simulation technology in the injection molding process for plastic optic lenses. The CAE program 3D TIMON was used to predict retardation, flow patterns and warpage deformation. The results were compared to the results of optic lenses as measured using the WPA-100 retardation measurement device with injection molding CAE for retardation predictions. According to the analysis and measured results, the distributions of retardation between the CAE results and the measurement results were similar. It was also confirmed that varying the injection speed had an effect on the injection pressure, warpage deformation and retardation distribution. As the injection speed increases, the injection pressure also increases and warpage deformation decreases. However, as the injection speed increases, the retardation distribution deteriorates.

A study on the thermal deformation of 3 cavity GMP mold for glass lens (GMP 공정용 3 cavity 유리 렌즈 금형의 열변형에 관한 연구)

  • Chang, Sung-Ho;Heo, Young-Moo;Shin, Gwang-Ho;Jung, Tae-Sung
    • Design & Manufacturing
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    • v.2 no.6
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    • pp.38-42
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    • 2008
  • Recently, the demands of digital camera and miniature camera module for mobile-phone is increased significantly. Lenses which is the core component of optical products are made by the injection molding(plastic lens) or GMP(glass lens). Plastic lens is not enough to improve the resolution and performance of optic parts. Therefore, the requirement of glass lens is increased because it is possible to ensure the high performance and resolution. In this paper, the thermal stress analysis of 3 cavity GMP mold for molding glass lens was performed for estimating the thermal stress and amount of deformation. Finally, the modification plan based on the analysis results was deducted.

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Development and Performance Property Investigation of Lighting System using Plastic Optical Fiber (플라스틱 광섬유를 이용한 조명시스템 개발과 특성 분석)

  • Shin, Sang-Uk;Yi, Chin-Woo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.12
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    • pp.25-32
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    • 2010
  • Compared to general lighting method, the lighting system that uses optic fiber can provide only the visible light of good quality to subject by eliminating ultraviolet ray and infrared ray. Thanks to this merit, it is possible to prevent the hard phenomenon of subject caused by ultraviolet ray and infrared ray and to provide the agreeable light environment. This study developed indoors illumination system of high color rendering on the basis of plastic optic fiber with excellent optical property and processing to substitute halogen lamp which has been used for excellent color rendering in spite of low efficiency and short life. Producing pilot product of the designed illumination system and evaluating the property of electric and optical property, ultraviolet ray radiation quantity and temperature property, this study verified the excellence of suggested lighting system of plastic optic fiber.

Application of Birefringence CAE in Mould Design of Optic Lens Injection Molding Process (광학렌즈 사출성형금형 설계에 있어서 CAE기술의 활용)

  • Yamanoi, Mikio;Kwak, Tae-Soo;Jung, Jong-Kyo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.3
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    • pp.1-6
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    • 2012
  • This study is focused on simulation technology in injection molding process for plastic optic lenses. The CAE program, $3D-TIMON^{TM}$ is used for the injection molding simulation with O-PET resin material. The design for different gate shape and runner layout has been under review by CAE simulation results. Moreover, the prediction of birefringence and polarized light in injection molded optic lenses has been tested by the CAE Program. The simulation results have been expected to effectively use in the design of injection molding mould.

Verification for transcription of spherical radius and prediction of birefringence in injection molding optical lens (초정밀 광학렌즈의 복굴절 예측과 금형 전사성)

  • Ohmori Hitoshi;Kwak Tae Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.6 s.171
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    • pp.55-60
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    • 2005
  • This paper has been focused in developing of plastic lens with ultra-precision and low birefringence ability using by injection molding simulation tools. The simulation tools, $3D-Timon^{TM}\;and\;Asu-Mold^{TM}$ were applied to visualize indirectly the flow pattern of melted polymer enter the mould and the simulation results are verified as compared with the experimental results. Birefringence and polarized light generated in injection molding process was also calculated for each injection conditions and compared with .the pictures of experimented optical lens go through the polarized light plates device. A spherical radius of plastic optical lens transcribed from profile of mould core surface was measured to estimate the geometrical accuracy fer the each injection conditions. It is confirmed that the simulation results about flow pattern and polarized light area coincided in experimental results. It is known that increasing in thickness shrinkage at center of lens, the spherical radius is larger from comparing the graph measured spherical radius and the thickness shrinkage at center of lens

Reduction of Birefringence and Weld-Line using Over-Flow in Injection Compression Molding for Optic Lens (광학렌즈의 사출압축성형에서 오버플로우를 이용한 웰드라인과 복굴절 저감)

  • Kong, Ki-Hwan;Lee, Jin-Hyo;Kang, Byung-Ook;Kwak, Tae-Soo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.1
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    • pp.95-100
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    • 2018
  • This study has focused on the weld-line and birefringence reduction of a plastic optic lens using over and CAE analysis in injection compression molding. A concave lens, which has a thin thickness in the center and a large difference in thickness between the center and the periphery, often causes weld-line defects during injection molding. CAE analysis has been applied to optimize the overflow design in order to reduce the weld-line defects and the polarization defects. To reduce the weld line and birefringence defects, overflow design and application using CAE analysis show that the measured birefringence values of the specimens before the overflow application were 46.8nm and 36.9nm, and the values after the over-flow application were 13.6nm and 14.0nm. From the experimental results, it is confirmed that birefringence is greatly improved when overflow is applied.